US5344268A - Anchor for anchoring in a drilled hole in concrete via a joining composition - Google Patents

Anchor for anchoring in a drilled hole in concrete via a joining composition Download PDF

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Publication number
US5344268A
US5344268A US08/014,387 US1438793A US5344268A US 5344268 A US5344268 A US 5344268A US 1438793 A US1438793 A US 1438793A US 5344268 A US5344268 A US 5344268A
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US
United States
Prior art keywords
anchor
expander cone
threaded bolt
face
expandable sleeve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US08/014,387
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English (en)
Inventor
Artur Fischer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fischerwerke Artur Fischer GmbH and Co KG
Original Assignee
Fischerwerke Artur Fischer GmbH and Co KG
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Filing date
Publication date
Application filed by Fischerwerke Artur Fischer GmbH and Co KG filed Critical Fischerwerke Artur Fischer GmbH and Co KG
Assigned to FISCHERWERKE ARTUR FISCHER GMBH & CO. KG reassignment FISCHERWERKE ARTUR FISCHER GMBH & CO. KG ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: FISCHER, ARTUR
Application granted granted Critical
Publication of US5344268A publication Critical patent/US5344268A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
    • F16B13/14—Non-metallic plugs or sleeves; Use of liquid, loose solid or kneadable material therefor
    • F16B13/141—Fixing plugs in holes by the use of settable material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
    • F16B13/04—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front
    • F16B13/06—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve
    • F16B13/063—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve by the use of an expander
    • F16B13/065—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve by the use of an expander fastened by extracting the screw, nail or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
    • F16B13/14—Non-metallic plugs or sleeves; Use of liquid, loose solid or kneadable material therefor
    • F16B13/141—Fixing plugs in holes by the use of settable material
    • F16B2013/148—Means for inhibiting adhesion between dowel or anchor bolt parts and the surrounding grouting composition
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S411/00—Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
    • Y10S411/924—Coupled nut and bolt
    • Y10S411/929—Thread lock
    • Y10S411/93—Flowing metal or settable material

Definitions

  • the invention relates to an anchor for anchoring in a drilled hole in concrete via a joining composition.
  • An anchor of this type comprising a threaded bolt having a threaded portion at one end, an expander cone widening toward its free end at the other end of the threaded bolt inserted in the drilled hole and an expandable sleeve enclosing the expander cone.
  • German Patent Application DE-A1-35 16 866 describes this type of anchor.
  • This known anchor is fixed by a method comprising inserting a glass capsule containing the joining composition into the drilled hole, the joining composition comprising polyester resin, a hardener and additives and crushing the glass capsule with the anchor.
  • the joining composition is activated by mixing its components during and subsequently to the crushing with the anchor. Once the joining composition has hardened the anchor is fixedly bonded and anchored in the drilled hole.
  • the anchorage is based in this instance essentially on the adhesive bond between the joining composition and the wall of the drilled hole.
  • an anchor for anchoring in a straight drilled hole in concrete via a joining composition comprising a threaded bolt having an expander cone at one end thereof to be inserted in a drilled hole in concrete for anchoring, the expander cone widening toward its end face; an expandable sleeve arranged on the threaded bolt enclosing the expander cone and structured to be expanded by the expander cone and a plastic covering on the end face and the outer surface of the expander cone.
  • a plastic covering is provided on the outer surface and the end face of the expander cone.
  • the anchor consists of a threaded bolt with an expander cone which is enclosed by an expandable sleeve.
  • the threaded bolt is covered in the region of the slotted expandable sleeve with a plastic material.
  • the expander cone and an adjoining portion of a straight shank of the threaded bolt are present in the region of the slotted expandable sleeve.
  • the plastic covering ensures that the joining composition does not cause inseparable adhesive bonds between the expandable sleeve and the threaded bolt.
  • the expander cone cannot be drawn into the expandable sleeve for subsequent expansion, if these inseparable adhesive bonds are formed.
  • a connecting pin projecting from the steel cap can be provided to form the releasable connection between the threaded bolt and the steel cap by engaging through a throughgoing hole in the plastic covering in the threaded bolt, particularly in a blind hole in the end face of the expander cone.
  • the plastic covering can be in the form of a one-piece plastic coating or comprise a plastic sleeve and a plastic disk located at the end face of the threaded bolt.
  • a crimped-over edge of the expandable sleeve in a preferred embodiment engages over the plastic disk in the edge region thereof and holds it fixed on the end face of the expander cone.
  • the sleeve of the plastic covering extends over as long a length of the shank of the threaded bolt as possible to allow a bond between the wall of the drilled hole and the expandable sleeve over the entire depth of the drilled hole.
  • the outer surface of the expandable sleeve is provided with a threaded portion or other configuration such as a helical structure to thereby reinforce the adhesive bond between the wall of the drilled hole and the expandable sleeve surrounding the threaded bolt.
  • FIG. 1 is a longitudinal cross-sectional view of an anchor according to the invention
  • FIG. 2 is a side elevational view of an expandable sleeve of the anchor shown in FIG. 1;
  • FIG. 3 is a side elevational view of a two-part plastic covering comprising a plastic sleeve and plastic disk for the anchor of FIG. 1, and
  • FIG. 4 is a top view of the part of the plastic cover covering the end face of the expander cone.
  • FIG. 5 is a plan view of the end-face steel cap of the anchor of FIG. 1.
  • the anchor illustrated in FIG. 1 consists of a threaded rod 1, an expandable sleeve 2 and an end-face steel cap 3.
  • the threaded bolt 1 has a threaded portion 4 on which a screw nut can be screwed to fix an article to the surface of a concrete part. Adjoining the threaded portion 4 there is a straight shank part 5 which is continued as an expander cone 6.
  • the expander cone 6 is located at that the free end of the anchor which is nearest to the bottom 8 of the drilled hole, when the anchor is inserted in the drilled hole 7.
  • the drilled hole 7 is a straight drilled hole in a concrete part 12. When a crack occurs in the region of the drilled hole 7, then the retention forces between the expandable sleeve 2 and the wall 10 of the drilled hole are adequate to fix the expandable sleeve in the drilled hole for a subsequent expansion process.
  • the subsequent expansion is effected in that a very slight axial movement of the threaded bolt 1 in the direction of arrow 13 widens the expandable sleeve slightly in its expansion zone 14.
  • An axial displacement of the expander cone 5 presses the conical outer surface 15 in the expansion zone 14 outwards, with the result that the retention forces between the expandable sleeve 2 and the wall 10 of the drilled hole are increased.
  • the threaded bolt 1 has a plastic covering 16, which consists of a plastic sleeve 17 and a plastic disk 18 mounted on the end face of the expander cone 6, to guarantee that the threaded bolt 1 and the inner surface of the expandable sleeve 2 slide easily over each other in the expansion zone 14.
  • the plastic disk 18 is held on the expander cone 6 by a crimped-over edge 19 of the expandable sleeve 2.
  • the steel cap 3 which tapers like a wedge, covers the plastic disk 18 and is frictionally connected by a connecting pin 20 to the plastic disk 18.
  • the connecting pin 20 projects axially downwards from the steel cap 3 and is fixed to it. It engages through a throughgoing hole 21 (FIG. 3) in the plastic disk 18 into an axially arranged blind hole 22 in the threaded bolt 1.
  • the diameter of the blind hole 22 is larger than that of the connecting pin 20, while the diameter of the throughgoing hole 21 is slightly smaller than that of the connecting pin 20.
  • the connecting pin 20 is therefore held frictionally in the plastic disk 18, and the steel cap 3 adhesively bonded in the drilled hole 7 by the joining composition does not therefore prevent an axial movement of the threaded bolt 1 in the direction of the arrow 13.
  • the embodiment of the expandable sleeve 2 illustrated in FIG. 2 is provided with an external thread 23.
  • the expandable sleeve 2 is provided with at least one elongate slot 25 which is open at the end of the expandable sleeve 2 and facilitates expansion of that portion of the expandable sleeve 2.
  • the circumferential surface 24 of the expandable sleeve 2 has a different structure; it is helical.
  • the plastic sleeve 17 is shown in FIG. 3 and the plastic disk 18 is shown in FIG. 4. Both parts together form the plastic covering in the region of the threaded bolt 1 which corresponds to the slotted expansion zone 14 of the expandable sleeve 2. It is essential that the plastic covering extend over the entire length of the elongate slot 25 so that also in the vicinity of the elongate slot 25 no joining composition 9 can come into contact with the metallic surface of the threaded rod 1. This reliably prevents adhesion of the metallic expandable sleeve 2 to the metallic threaded bolt 1.
  • the steel cap 3 is illustrated in FIG. 5 and is shaped like a wedge with a circular base.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dowels (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
US08/014,387 1992-02-13 1993-02-05 Anchor for anchoring in a drilled hole in concrete via a joining composition Expired - Fee Related US5344268A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4204214 1992-02-13
DE4204214A DE4204214A1 (de) 1992-02-13 1992-02-13 Anker zur verankerung mittels einer verbundmasse in einem bohrloch eines betonteils

Publications (1)

Publication Number Publication Date
US5344268A true US5344268A (en) 1994-09-06

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Family Applications (1)

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US08/014,387 Expired - Fee Related US5344268A (en) 1992-02-13 1993-02-05 Anchor for anchoring in a drilled hole in concrete via a joining composition

Country Status (7)

Country Link
US (1) US5344268A (ja)
EP (1) EP0555542B1 (ja)
JP (1) JPH0672604B2 (ja)
AT (1) ATE129319T1 (ja)
BR (1) BR9300549A (ja)
DE (2) DE4204214A1 (ja)
ES (1) ES2080420T3 (ja)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0773373A1 (de) * 1995-11-08 1997-05-14 fischerwerke Artur Fischer GmbH & Co. KG Metallspreizanker
US5685678A (en) * 1995-02-21 1997-11-11 Giannuzzi; Anthony C. Fail-safe anchor bolt assembly for cracked masonry
US5807051A (en) * 1995-09-18 1998-09-15 United Industries Corporation Dielectric adhesive insert anchor
US5984369A (en) * 1997-06-16 1999-11-16 Cordant Technologies Inc. Assembly including tubular bodies and mated with a compression loaded adhesive bond
US20110052332A1 (en) * 2009-09-01 2011-03-03 Fci Holdings Delaware, Inc. Yielding Bolt and Assembly
US20110183025A1 (en) * 2010-01-25 2011-07-28 Funka Jr Thomas M Scoop incorporating a heat transfer fluid
US8959863B2 (en) 2012-05-22 2015-02-24 Gerald R. Gray Method and apparatus to fill and fire proof holes in concrete floors of commercial buildings utilizing a precast plug
US9765541B2 (en) 2012-05-22 2017-09-19 Gerald R. Gray Method and apparatus to fill and fire proof holes in concrete floors
US9909330B2 (en) 2012-05-22 2018-03-06 Gerald R. Gray Method and apparatus to fill and fire proof holes in concrete floors
US11598085B2 (en) * 2017-11-09 2023-03-07 Fs Technical Corporation Anchor bolt for adhesive anchor, adhesive anchor, and method for constructing adhesive anchor
US11644062B2 (en) 2020-10-12 2023-05-09 Siemens Medical Solutions Usa, Inc. Anchoring system for attaching equipment to a building foundation

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4439861A1 (de) * 1994-11-08 1996-05-09 Fischer Artur Werke Gmbh Ankerbolzen zur Verankerung mittels einer Verbundmasse
DE19522026A1 (de) * 1995-06-17 1996-12-19 Mkt Metall Kunststoff Technik Spreizdübel
DE19523867A1 (de) * 1995-06-30 1997-01-02 Fischer Artur Werke Gmbh Spreizanker zur Verankerung mittels eines Reaktionsharzes
DE19900676C2 (de) * 1999-01-11 2002-10-24 Mea Meisinger Stahl & Kunststo Anker zur Verankerung in einer Verbundmasse
DE102015115833A1 (de) * 2015-09-18 2017-03-23 Fischerwerke Gmbh & Co. Kg Befestigungsanordnung
EP3569876A1 (de) * 2018-05-14 2019-11-20 HILTI Aktiengesellschaft Ankerbolzen zur verwendung in befestigungsmörtel, befestigungssystem und verfahren zur herstellung eines ankerbolzens

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2203178A (en) * 1930-02-20 1940-06-04 Ralph S Peirce Anchoring device
US2994243A (en) * 1958-05-02 1961-08-01 Langstroth Hall Fastening device
DE7021545U (de) * 1970-06-09 1970-09-17 Mueller Peter Maueranker mit selbsttaetiger fuell- u. haftstoffauspressung an vorbestimmbare haftzonen.
DE2622114A1 (de) * 1976-05-18 1977-12-01 Brueckl Technik Verfahren und vorrichtung zum setzen eines befestigungsankers
DE3238751A1 (de) * 1982-10-20 1984-04-26 Artur Dr.H.C. 7244 Waldachtal Fischer Befestigungselement fuer die verankerung in einem bohrloch unter verwendung einer reaktiven mehrkomponentenmasse
DE3516866A1 (de) * 1985-05-10 1986-11-13 Artur Dr.H.C. 7244 Waldachtal Fischer Verankerung einer gewindestange mittels einer verbundmasse
WO1988007141A2 (en) * 1987-03-18 1988-09-22 Upat Gmbh & Co. Fixing rod
EP0352226A2 (de) * 1988-07-08 1990-01-24 HILTI Aktiengesellschaft Ankerstange
DE3841577A1 (de) * 1988-12-09 1990-06-13 Fischer Artur Werke Gmbh Injektionsadapter mit einem befestigungselement und verfahren zum anbringen eines korrosionsschutzes
US5076733A (en) * 1990-05-04 1991-12-31 Jennmar Corporation Mine roof anchor assembly having an expansion shell assembly with a friction reducing means
US5082399A (en) * 1988-08-08 1992-01-21 Jennmar Corporation Mine roof anchor having adjustable resin retaining washer and expansion shell assembly with friction reducing means
US5176481A (en) * 1991-05-17 1993-01-05 Hilti Aktiengesellschaft Expansion dowel with friction reducing coating

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4516883A (en) * 1983-04-01 1985-05-14 Die-Matic Corporation Mine roof bolt mounting assembly
ES2019647B3 (es) * 1986-06-24 1991-07-01 Forges Et Boulonneries D'ars-Sur-Moselle Bulon de contencion extensible, metodo de contencion, utilizacion del bulon.

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2203178A (en) * 1930-02-20 1940-06-04 Ralph S Peirce Anchoring device
US2994243A (en) * 1958-05-02 1961-08-01 Langstroth Hall Fastening device
DE7021545U (de) * 1970-06-09 1970-09-17 Mueller Peter Maueranker mit selbsttaetiger fuell- u. haftstoffauspressung an vorbestimmbare haftzonen.
DE2622114A1 (de) * 1976-05-18 1977-12-01 Brueckl Technik Verfahren und vorrichtung zum setzen eines befestigungsankers
DE3238751A1 (de) * 1982-10-20 1984-04-26 Artur Dr.H.C. 7244 Waldachtal Fischer Befestigungselement fuer die verankerung in einem bohrloch unter verwendung einer reaktiven mehrkomponentenmasse
DE3516866A1 (de) * 1985-05-10 1986-11-13 Artur Dr.H.C. 7244 Waldachtal Fischer Verankerung einer gewindestange mittels einer verbundmasse
WO1988007141A2 (en) * 1987-03-18 1988-09-22 Upat Gmbh & Co. Fixing rod
EP0352226A2 (de) * 1988-07-08 1990-01-24 HILTI Aktiengesellschaft Ankerstange
US5082399A (en) * 1988-08-08 1992-01-21 Jennmar Corporation Mine roof anchor having adjustable resin retaining washer and expansion shell assembly with friction reducing means
DE3841577A1 (de) * 1988-12-09 1990-06-13 Fischer Artur Werke Gmbh Injektionsadapter mit einem befestigungselement und verfahren zum anbringen eines korrosionsschutzes
US5076733A (en) * 1990-05-04 1991-12-31 Jennmar Corporation Mine roof anchor assembly having an expansion shell assembly with a friction reducing means
US5176481A (en) * 1991-05-17 1993-01-05 Hilti Aktiengesellschaft Expansion dowel with friction reducing coating

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5685678A (en) * 1995-02-21 1997-11-11 Giannuzzi; Anthony C. Fail-safe anchor bolt assembly for cracked masonry
US5807051A (en) * 1995-09-18 1998-09-15 United Industries Corporation Dielectric adhesive insert anchor
EP0773373A1 (de) * 1995-11-08 1997-05-14 fischerwerke Artur Fischer GmbH & Co. KG Metallspreizanker
US5690455A (en) * 1995-11-08 1997-11-25 Fischerwerke Artur Fischer Gmbh & Co. Kg Metal expansible anchor
US5984369A (en) * 1997-06-16 1999-11-16 Cordant Technologies Inc. Assembly including tubular bodies and mated with a compression loaded adhesive bond
CN102317573A (zh) * 2009-09-01 2012-01-11 Fci特拉华控股有限公司 屈服式锚杆及组件
WO2011028790A1 (en) * 2009-09-01 2011-03-10 Fci Holdings Delaware, Inc. Yielding bolt and assembly
US20110052332A1 (en) * 2009-09-01 2011-03-03 Fci Holdings Delaware, Inc. Yielding Bolt and Assembly
CN102317573B (zh) * 2009-09-01 2014-02-12 Fci特拉华控股有限公司 屈服式锚杆及组件
US8721227B2 (en) 2009-09-01 2014-05-13 Fci Holdings Delaware, Inc. Yielding bolt and assembly
US20110183025A1 (en) * 2010-01-25 2011-07-28 Funka Jr Thomas M Scoop incorporating a heat transfer fluid
US9145696B2 (en) 2012-05-22 2015-09-29 Gerald R. Gray Method and apparatus to fill and fire proof holes in concrete floors of commercial buildings utilizing a precast plug
US8959863B2 (en) 2012-05-22 2015-02-24 Gerald R. Gray Method and apparatus to fill and fire proof holes in concrete floors of commercial buildings utilizing a precast plug
US9316009B2 (en) 2012-05-22 2016-04-19 Gerald R. Gray Method and apparatus to fill and fire proof holes in concrete floors of commercial buildings utilizing a precast plug
US9366044B2 (en) 2012-05-22 2016-06-14 Gerald R. Gray Method and apparatus to fill and fire proof holes in concrete floors of commercial buildings utilizing a precast plug
US9765541B2 (en) 2012-05-22 2017-09-19 Gerald R. Gray Method and apparatus to fill and fire proof holes in concrete floors
US9909330B2 (en) 2012-05-22 2018-03-06 Gerald R. Gray Method and apparatus to fill and fire proof holes in concrete floors
US11598085B2 (en) * 2017-11-09 2023-03-07 Fs Technical Corporation Anchor bolt for adhesive anchor, adhesive anchor, and method for constructing adhesive anchor
US11644062B2 (en) 2020-10-12 2023-05-09 Siemens Medical Solutions Usa, Inc. Anchoring system for attaching equipment to a building foundation

Also Published As

Publication number Publication date
DE59204070D1 (de) 1995-11-23
ATE129319T1 (de) 1995-11-15
JPH0672604B2 (ja) 1994-09-14
DE4204214A1 (de) 1993-08-19
EP0555542B1 (de) 1995-10-18
JPH05280516A (ja) 1993-10-26
BR9300549A (pt) 1993-08-17
EP0555542A1 (de) 1993-08-18
ES2080420T3 (es) 1996-02-01

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Owner name: FISCHERWERKE ARTUR FISCHER GMBH & CO. KG, GERMANY

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Effective date: 19930120

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FP Lapsed due to failure to pay maintenance fee

Effective date: 19980906

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362